A crown (also called a cap) is a prosthetic covering that is used to restore teeth where the structure is too weakened or damaged to accept amalgam or dental composite fillings. The most common type of crown is made out of porcelain fused to metal (PFM). After a few years, recession of the gums can expose the metal, causing black margins against the gum. And for some, the metal can cause allergic reactions and gum tissue irritation.

A metal free crown is solely composed of reinforced porcelain, which creates a more natural looking smile. These crowns allow the natural tooth color to show through, aiding in more effective color matching. Since porcelain is a very strong material, it can actually increase the strength of the tooth.